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She tweeted: 'I feel like I got hit
in my right side of my face with a baseball bat :(

'NOT a good feeling
when I am getting on a plane. For all my fans at Wendover last night
[Friday], the show will be rescheduled, not a canceled show.

'WORST way ever to kick off a tour…
under anesthesia and a massive infection. Well, onward and upward. It
can only get better from here!!! On another note, Happy Saturday.'

Petite: LeAnn showed off her trim figure in the clingy creation

Belting it out: LeAnn seems to be back on track - although cancelled a performance on Friday

LeAnn took to the stage in a body
contour dress, opting for the natural look with her long blonde locks
pushed away from her face
so onlookers could see her smile.

Her champagne colour frock, which
gradually featured more tones toward the hemline, emphasised her bust
area and showed off her fit frame.

She teamed the number with a pair of
high heel Christian Louboutin shoes, and the added height appeared to
have given her mounds of confidence.

Trim: LeAnn sparked rumours of an eating disorder with her weight, but denied that was the reason for rehab

Her
husband Eddie Cibrian - who has two children with The Real Housewives
of Beverly Hills star Brandy Glanville - was nowhere to be seen.

The two women had a very public falling out after Brandi accused LeAnn of being a home-wrecker.

Yet things seem to be on the mend after Glanville said she supported Rimes' decision to head to rehab, saying: 'I totally support LeAnn's decision to enter rehab - my top priority is my children, and at the end of the day we are a family.

'LeAnn is their stepmom, and they love her. I am wishing her all the best and I hope she will find what she is looking for while in rehab.'

LeAnn recently left her treatment facility and told the Boston Herald
that she tried desperately hard to ignore hateful things hurled at her
on social networking sites, but in the end it all got too much.

Looking good: The singer showed off her toned body in the outfit complemented with Christian Louboutins

'I think it's really hard to deal with Twitter and Facebook and all these social media outlets,' she told the newspaper.

'It's
hard to take it day after day of reading and seeing things that someone
you don't even know says about you.

'As much as you said you don't want
it to penetrate, it does, because you're human.'

She says that in rehab she learned how to shift focus on herself, rather than others' points of view.

Fresh from rehab: The 30-year-old recently revealed that it hurts to hear bad things from online critics